Motor-driven compressor.



'H. W. CHENEY.

MOTOR DRIVEN COMPRESSOR.

APPLICATION FILED MAY 15. 1912.

1,172,581. Patented Feb. 22,1916.

2 SHEETS SHEET I.

THE COLUMBIA PLQNQGRAPH co., WASHINGTON, u. C,

ATTIIIRNEY- H. W.HENEY. MOTOR DRIVEN COMPRESSOR.

APPLICATION FILED MAY 15, 1912.

1,172,581. I Patented Feb. 22,1916.

2 SHEETS-SHEET 2- WITNEEEES- |NvENfi-;u

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AT-F NEY THE COLUMBIA PLANOGRAPH co., WASHINGTON, n. c. 4

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EEnBnnr-w. CHENEY, on MILWAUKEE, Wisconsin, nssieivon, BY Mnsnn ASSIGN-V MENTS, TO ALLIS-CHALMERS MANUFACTURING COMPANY, "A conronATIon 0F DELAWARE. g

: MOTOR-DRIVEN comrnnsson;

1,172,581. Specificationoftenfratent- Patented Feb.22,1916.

Application filed May'lS, 1912. Serial No. 698,024. I

To all whom it may concern:

a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Improvement in Motor- Driven Compressors, of which thefollowing is a specification. I

This invention relates to motor driven pumps or air compressors and hasyfor'its object the provision of such a motor driven compressor which is direct connected or devoid of the usual gearing, and which may run at very high speed, even as high as 1200 revoluticns per minute, and which is greatly reduced in weight, width, and especially in height. i I

More particularly the invention relates to an inlet valve for compressors, and generally to details of Construction of the mo" tor compressor. 1

Comparing a usual form of motor driven compressor, such as that of. Christensen Patent 635,280, Oct. 17, 1899, with the present machine of a capacity at least equal to that of the Christensen type, the weight of the latter machine is per cent. greater,

the height is 70 per cent. greater, the width 1 is 20 per cent. greater, while the length is substantially the same as the corresponding weight and dim nsions of the present machine. At a glance therefore, it is apparent that the present machine-is substantially iniproved over machines of the prior art of which the Christensen is a well known type.

The invention is illustrated in the accompanyingdrawings in the various figures of which like reference characters designate the same or similar parts Figure 1' is a plan view of the motor driven compressor, partly in section; Fig. 2

i is an end elevation of the motor driven compressor, partly in section on the line HII of Fig. 1, the View being taken in the direction of the arrow indicated at.

the. line IL-II. Fig. 3 is a side elevation of the motor drivencompressor viewed from' the cylinder side thereof, some of themternal construction being shown'in dotted lines. v

The frame of the motor driven compressor comprises generally three parts, the motor frame 1, the crank case 2, and the intermediate connecting piece 3. A clamping ring a u s e end of e e r fra e W le case cover plate 9 closes mg in the crank case.

D a flange 5,011 the connecting piece 3 abuts Be it known that I, HERBERT W. CHENEY,

the'opposite end of the motor frame 1, and bolts 6 connect together the clampi-ng'ring connecting piece 3. The'motor frame 1, the crank case 2 and the connecting piece 3 --areformed with surfaces of revolution at the places .of coaction between. these elements to facilitate the lining uptof these parts when they are connectedthe' one'to the other.- A motor cover plate 8 closes the end of the motor frame 1,'while'the crank a hand-hole open- I series of cylinder supports '10. have integral therewith a base plate 11 andare con-Q nected by bolts 12lto an opening "in the Y a crankcase oppositethe hand-hole opening.

These cylinder supports 10 have formed integral therewith connectingpor tions 13, 14,; of-which one is located above the "supports 1 and ;C01lSt1tUt(-3S a discharge conduit 140,

while the other is located below the sup-- ports and c'onstitutesa part of'an inlet conduit or chamber 1-5. Straps 16, 16, bolted ,to the motor frame 1', and a strap 17' bolted to the-crank case'2, are provided for bolting the motor driven compressor underneath" a car on which'the device; 18. provided.

The armature 18 on the. motor iskeyedf to a taper portion 19 of a cranked armature .l'

shaft 20, and a nut 21 is threaded on-the end fof the taper portlon 19 for holding the lrmature in place on the said shaft. A part ofthe armature 18 isprovided with screw threads 22provided for coaction with screw threads on a cap, not shown, which is'adapted to coact with theendof the shaft-20 for the purpose of forcing the armature 18 oil the taper portion 19 after first removing the nut 21. The clamping ring 4: furnishes a means for vsupporting the. brushes .of the motor, a; support 23 being conventionally shovin r N The main bearing24: for, thef cranked armature shaft 20 is-formed'in 'the connectpieceB' and eXtencls-, well into the armature 18. The. only other bearing 201, for, the cranked. armature shaft "20 is formed in the crank case-2, at an-end thereof, beyond 7 the cranked portio'ns' of the shaft. This bearing, 201 is suitably. supplied with oil through. port .202. Themain bearing 2 purpose.

supplied with oil through a port 25, see Fig.

3, formed therethrough and through a bear- 1ng sleeve 26held 1n the bearing 24. For I 7 piece 3 at the lowest point thereof for draining oil to the outside of the motor driven compressor.

Referring more specifically to the cylinder supports 10 and parts associated therewith, these cylinder supports 10 support cylinders 33 therein, the bores of the supports 10 forming counter-bores 34 when considered with reference to the bores or" the cylinder proper 33. The cylinders 33 are held in place by having formed thereon flanges 35. Bolts 36 clamp heads 37 to the supports 10,

at the same time clamping the flange 35 between'the heads 37 and the supports 10 in recesses in the supports 10 provided'for that The cylinders. 33 are provided with puppet valve seats 33 for puppet va ves 39, having theirstems 40 supported by passingthrough bores in the heads 37 These stems 40 extend into pots 41 formed in the outer side of the heads 37 and have a portion thereoi threaded foriastening thereto plungers 42 fitting the pots 41.

other end reacting against the caps 43, tending'at all times to force the valves 39 to their seats 38.

Sleeves 45 fit within the supports 10 and are connected to cranksor eccentrics 46 by means of eccentric rods 47, these being pivoted to the sleeve by pins 48. The sleeves 45,

see Fi 2 have extensions 49 at the lower.

side of their crank case ends, coacting with guide grooves 50 formed 1n the crank case 2. On the exterior, and near their 0pposite ends, are formed oil packing grooves 51. These sleeves 45 are equal in thickness with the cylinders 33, so that when the sleeves abut with their ends the open ends,

of the cylinders 33, the interior of the sleeves 45 will form with the interior of the cylinders33 a continuous cylindrical'space. Pistons'52 fit-within the sleeves 45 and also within the cylinders 33 and have the usual spring packing rings The pistons 52 are connected by pins 54 to connecting rods 55, and these inturnare connected tocranks 56 of the cranked'a-rmature shaft. 20. The

Caps close the outer endof the pots 41 and springs 44, within the pots41, have their one end acting against-the plungers 42','and their.

pins54 are held in place in the pistons 52 by locking screws 57 screwed through the. PlStOIlilHCl promoting into grooves58 formed in the pins 54. The cranks or eccentrics 46 have an angular advance of about 45 degrees with respect to their corresponding cranks 56;"Inlet ports 59, 59, are formed; in

the supports 10 and connect with the inlet conduit or chamber 15'whfch is completed by a plate 60 bolted to the lower connecting portion 14. This inlet conduit or chamber 15 has an inlet opening 61 leading thereto formed in the plate 60 for an inlet pipe 62 which may be led .toany convenient point for supply of atmospheric air through the usual strainer, not shown. A discharge pipe 63 communicates with the dischargeconduit 140.

A supporting lug-64 is formed atthei lower part of the crank case 2 and extends tothe lowest level of the motor frame. 1.v

This supportinglugforms a support for the crank case 2 when otherwise blocked up, at such times as the-motortramel may be disconnected from the motor driven com-- pressor. I

V A plug 65 closes an opening into the crank case -2.for supplying lubricating oil thereto, of which an abundant supply is maintained in the bottom of the chamber therein. A drain plug 66 closes an opening into the lowest part of the crank case 2.

opposite the pocket 67. A'vent 69 connects ironi' the atmosphere into the crank case 2- at'the upper end Ofylihe pocket 68. This vent is closed by a suitablescreen, not spe cifically indicated. Strengthening ribs 70, 70, 70, 70, are formed on the crank case 2 extending to the edge of the flange formed thereon. A door 71 closes an opening in the motor cover plate 8. Oil conduits 72 are formed in the supports 10 and connect with passages 7 3 formed in the crank case 2 draining-from a pocket 74 formed in the upper part of the crank case 2.; These conduits 72 terminate in the bores 01" the supports 10. The oil conduits 72 are formed by intersecting pas- The lowest portion of the crank case 2 takes the form of: a pocket 67. A. similar pocket 68 is formed 5 in the highest portion of the crank case2 sages, one of which leads to the atmospherebut is stopped oft by a plug 720 in the. bot tom of which a screw 721 is threaded supporting a series of felt washers 722 directly opposite the remaining intersecting passage 9 of the conduit 72.1

During the operation 01 the motor driven;

compressor, andv considering the beginning of the stroke of the piston. as shown in the first compressor in section in Fig. 1, the sleeve 45 has already performed a portion of its compressingstroke-and is partly .cov; ermg the ln'let'ports '59. The sleeve 45 is thereforeconstantlyaccelerating- --speed splash same in all directions. I fill the pocket 74 and will flow therefrom while the piston 52 is moving very slowly, the direction of piston motion being indicated in this figure by arrows. The middle compressor shown in this figure is next in advance of the one just considered and shows the sleeve 45 as having passed the inlet ports 59 and about to complete its stroke by abutting with its end the end of the cylinder 33. The piston 52 in this case is shown as having more than half completed its stroke. As it continues in'its stroke its advancing der 33 at the time of abutment between the sleeve 45 and the cylinder 33. This insures that the air compressed by the sleeve 45 between its end and the end of cylinder 33 Will be forced out into the continuous cylindrical space'formed Within the cylinder 33 and the sleeve 45, and this air will then be carried alon by the piston 52 into the cylinder 33 to be further compressed and finally to be forced past the discharge valve 39. There is practically no clearance. As soon as the piston 52 passes the abutting faces of the sleeve 45 and cylinder33 on itscompressing stroke, the sleeve 45 begins its return stroke, but the pi ton has by this time sealed the cylinder 33 from. any back flow,

of air. A partial vacuum may form during the first part of the receding stroke of the sleeve 4-5 up to the point Where the inlet ports 59-are uncovered. And the same thing may occur in the cylinder 33 during the first part or" the receding stroke of the piston 52 up to the time the piston 52 leaves the cylinder 33, but these vacua will only cause a quicker inrush of inlet air. The third compressor shown in section in Fig. 2 shows the sleeve and piston both in reced ing position, the piston moving much'faster than the sleeve so that at the end of its receding stroke the piston Will be in position with reference to the sleeve as best shown in the first compressor in section in Fig. 1. The cycle of operations just described Will then be repeated. Vhen the discharge valve 39 is forced open by the compression of air in front of it in the cylinder 33, it causes. its

plunger to compress air in the pot 41 and also to compress the spring 44: therein, both of these compressions tending to return the valve 39 quickly to its seat the instant the piston commences its receding stroke. The air confined on the valve side of the plunger 42 will serve as a cushion to avoid shock in the seating of the valve 39.

As the motor driven compressor operates,-

the mo *ing parts in the crank chamber Will dip into the oil 1n the bottom thereof and The 011 Wlll through the passage 73 and the conduit 72 to lubricate the sleeve 45 and the piston 52. During its passage through the conduit 72 it will be filtered by the felt washers 722.

face passes into cylintight except at the The pin 54 Will be lubricated directly from the splash of oil. The pocket 27 Will also be filled by the splashing of the oil therein, from which the oil will drain port 25 and through the sleeve 26 to the middle of the main bearing of the shaft 20. From this, point the oil will drain in one direction directly back to the chamber of the crank case 2, and in the other direction to the groove 28 in the sleeve 26, and from thence throughthe conduit 29 in the con necting piece 3 directly back into the chamber in the crank case 2.

It will be seen that the sleeve has three separate functions; first, it serves as a valve for opening and closing the inlet ports 59; second, it serves as a piston in compressing air in the counterbore 34; third, it serves as a continuation of cylinder 33 for the piston It should be noted that the support 10 reed not necessarily be atmospheric'ally counterbore portion 34: serving as a cylinder for the sleeve l5 when the sleeve isoperating its piston function, but it is formed atmospherically tight for the purpose of preventing the escape of oil, especiallythat supplied th ough the conduit 72 to the upper part of the sleeve 45. Itshould also be noted that the heads 37 are tormed with conduits which connect thespace beyond the puppet valve to the com,-

mon discharge conduit on the suppo'ts 10. This construction Will permit of t.1e' dismantling or" the heads and cylinders Wltlh out disturbing the piping connections.

It should be understood that it is not desired to be limited to the exact details of construction shown and described, for obvious modifications Will'occur to a person skilled in the art.

It is claimed and desired-to secure by Letters Patent,

1. In a compressor, the combination of a cylinder having a bore, a reciprocable' sleeve having a bore continuous With the bore of said cylinder, and piston sliding Within said cylinder and sleeve.

2. In a compressor, the combination of cylinder havinga bore, a sleeve having a piston and reciprocable to abut the end-of said cylinder at thetime said piston enters said cylinder." 0

5. In a compressor, the combination of a through the cylinder having a support forming a counterbore, a piston reciprocable into .and out of said cylinder, and a sleeve fitting said piston and reciprccable into and out of said counterbore to abut the end of said cylinder at the time said piston enters said cylinder.

6. In a compressor, the combination of a motor, a motor shaft, and a compressor-having a reciprocable valve-piston-cylinder sleeve direct connected to said shaft, said sleeve during at least a portion of its reciprocation serving to compress elastic fluid.

7. In combinatmn, a cylinder having a bore, a reciprocable imperiorate valve-piston-cylinder sleeve having a bore continuous with said cylinder bore, and a piston sliding within the bores of said cylinder and sleeve.

8. In combination, a cylinder-having a bore, an imperforate valve-piston-cylinder sleeve having a bore, said sleeve being reciprocable to abut an end of said cylinder, and. a piston reciprocable Within the bores of said cylinder and sleeve.

9. In a compressor, the combination of :1

crank case having an opening therein, a removable cylinder, spaced from said crank case, an atmospherically tight support connecting said cylinder to said crank case at said opening, parts operating Within said cylinder and support, and means for supplying oil to said parts.

10. in compressor, the combination of a crank case having an opening therein, a series of cylinder supports, a base plate integral with supports and bolted. to said case at said opening therein, connecting portions integral with said supports and extending laterally along opposite sides of said and "forming inlet and discharge chain-- hers respectively, and heads bolted to said supports. 7

11. The combination of asupport, a cylinder snugly fitting but removable "from said support, said cylinder forming a puppet valve seat, a puppet valve for said seat, and

head for said support clamping said cylinder in place in said support whereby said seat is on a part independent of said head, and is removable with said cylinder by detachment of said head.

12. In combination, a cylinder having a Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

bore, a reciprocable imperforate sleeve having a bore concentric With said cylinder bore,

and a piston sliding" Within and coacting directly with the bores of said cylinder and sleeve.

18. In a. compressor, the combination of a motor, a motor shaft,'a co-mpressorhaving a reciprocable valvepiston-cylinder sleevedirect connected to said shaft, and, a

piston reciprocablewithin said sleeve, said: sleeve during'its reciprocation serving to positively displace fluid for compression by said piston.

1d. Ina compressor, a crank case, a cylinder spaced from and open-ended toward the crank case, a piston entering and entirely leaving said cylinder during normal operation and a reciprocable valve-piston-cylinder sleeve surrounding said piston and movable to abut said cylinder,

1*. In combination, a cylinder having a bore, and a reciprocable imperi orate valvepiston-cylinder sleeve having a bore con tinuous with said cylinder bore.

16. In combination, a cylinder having a bore, a reciprocable imperforate sleevehaving av bore concentric with said cylinder bore, and means coactinp; directly with the bores of said cylinder and sleeve.

17. In combination, a cylinder havinga bore, a reciprocable imperforate valve-pistomcylinder sleeve having a bore concentric vith said cylinder bore, and means coacting of two Witnesses. I

HERBERT W. CHENEY.

V'fitnesses CHAS. L. BYRON, G. F. DEVVEIN.

Washington, D. C.

' the inventor is aiiixed hereto in the presence Corrections in Letters Patent No. 1,172,581.

It is hereby certified that in Letters Patent N 0. 1,172,581, granted February 22, 1916, upon the application of Herbert W. Cheney, of Milwaukee, Wisconsin, for an improvement in Motor-Driven Compressors, errors appear in the printed specification requiring correction as follows: Page 4, line 28, claim 9, after the Word cylinder strike out the comma; same page, line 50, claim 11, after the Word head strike out the comma; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 14th day of March, A. D., 1916.

J. T. NEWTON,

Acting Commissioner of Patents.

[SEAL] 

